Abstract
Decomposition temperatures were correlated with frequencies of valence and deformation bond vibrations in a series of N-substituted derivatives of 2,4- and 2,6-dinitroanilines (DNA). These vibrations are directly influenced by the nitro group structure and by its resonance and inductive interaction with the benzene ring. Analysis of the infrared spectra reveals a great sensitivity of the frequency and hence the CAr- NO2 bond order on the substitution character of the amino group, whereas the frequencies of the valence vibrations of theo-nitro group are influenced to a small extent only. However, at the same time the valence vibration of CAr-NO2 is a sensitive indicator of the thermal stabilities of 2,4-DNA and 2,6-DNA.
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